It also raised the temperature of my humidity dome.
Heating mat temp for clones.
If you go colder than that the cuttings root development might stall or just never happen at all especially if your cutting root zone is below 69 degrees f.
You can increase your marijuana cuttings root zone temperature by using a propagation heating mat.
They also sell dial adjustable temperature control units for the heating pads.
Temperatures between 74 77 fahrenheit are the range you want.
I got rooted clones in 7 9 days on the dot every time with a wick style cloner made up of solo cups t shirt strips and coarse perlite with a sandwich baggy to keep in the humidity and i would vent it daily and keep it about a foot from the light.
Hydrofarm seedling heat mat 10 x20 temperature controller jsv2 lighting system here is an all in one system that is perfect for growing your own seeds or clones.
If you are cooking the cuttings.
No heating mat required and minimal cost.
Your room temp is already on the high side for clones especially with a dome and all the humidity that goes with it so you would find the temperature under the dome to be a few degrees higher then the ambient of the room.
Place the seed flat on top of the mat evenly distributing the heat source across the bottom of the flat.
I used a heating mat it was kinda hot so i used pencils to elevate my clone tray and humidity dome off of it.
Check the flats every day to make sure the heat is held at a steady temperature and the soil has consistent adequate moisture.
While established marijuana plants can handle a wider range in root zone temperatures clones and seedlings will do much better with a root zone temperature of about 75 degrees fahrenheit.
By simply placing a heating mat under a seedling tray you can create the perfect root zone conditions for cuttings and seed starts.
Cuttings of most plants root best when the rooting medium is at.
Plug in the heat mat and set the thermostat to the desired temperature range.
I had them in my garage which is less than 60 degrees at night.
However this means you have to germinate in small rooms otherwise the heat mat will work too hard to keep the temperature 10 degrees above a colder room and burn itself out.